Exiting CN’s St. Clair Tunnel By | November 11, 2022 Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates In a view from the head end, an eastbound train led by St. Clair Tunnel Co. electrics exits Canadian National’s Port Huron, Mich.–Sarnia, Ont., St. Clair Tunnel in 1958. Jim Davis photo